How Do Seals Communicate? All kinds of seals communicate vocally by making noise with their throat and air. First, make sure that the collar is fitted properly and is not too tight or too loose. The waterproof aerosol spray also be used to coat the underside of a lawn mower deck to protect from debris damage. The fruit, stem and root bark contain alkaloids, the most prominent being berberine. There are several possibilities here based on your description #1 If your pet is making this sound and is also having a hard time catching her breath or seems to have trouble breathing, then this could potentially be a laryngeal paralysis (layrnx muscle not opening and closing properly). Both seals and dogs are known to be curious and playful, and both animals are known for their deep mournful stares. S. Perform a bridge graft. :) Do seals or sea lions have the earlobes? Sea lions have earlobes, but seals have ears without lobes. Like many 'generalised' carnivores, the Common or Harbour seal Phoca vitulina is a surprisingly adaptable predator, even if it is rather conservative in diet and choice of foraging habitat (e. The military's so-called Multi-Purpose Canines are specially selected and trained to. Bearded seals are the largest of the northern phocid seals (Fig. They’re also known to leap onto the ice to grab their prey and drag. What Other Sounds Do Birds Make? What are some sounds birds make? Birds can make a variety of sounds, but the pigeon’s coo is its most common. Weddell seals send out long, low whistles underwater at very high decibel levels, and. Bark collars are a type of collar that are used on dogs to help train them not to bark excessively. 1 metre-long Baikal seal to the 6. Since leopard seal population densities are low due to their solitary lifestyles, finding a mate can be difficult. certain part of that "change process," you get the noise. This type of cough is most often associated with croup (laryngotracheitis). A U. Some seals are actually vegetarians and only eat plants. Sea lions often toss the fish or squid up and around until it can slide headfirst down the mouth. Here, caretakers at Smithsonian's National Zoo explain why they make these. There may be some benefit in treating wounds of trees particularly susceptible to. Wound dressings are not necessary and even can be. The sights and sounds of an elephant seal colony are part of the symphony of California's wild places. This act is called periscoping. Meaning or Interpretation. Like the Assateague ponies, one can’t help but want to get closer and even touch or feed them. We would like to show you a description here but the site won’t allow us. The thing is, there is no one-size-fits-all. Seals, also known as pinnipeds (Latin for “fin footed”), are semi-aquatic marine mammals found in polar, temperate and tropical regions, especially in the North Atlantic, the North Pacific, and the Southern Ocean. California sea lions are “eared seals” native to the West Coast of North America. SHARE Seal: Seals are part of a group of mammals called pinnipeds, which translates to “fin-footed. These assaults. Adults are 2–2. The other resident eared seal is the Steller, or Northern, sea lion (Eumetopias jubata), a federally threatened species. Flu Vaccine. @Dogxiguazai posted the hilarious and viral clip,. S. Some seals are actually vegetarians and only eat plants. . Excessive barking is a common cause of dogs barking excessively. Even in the rare scenario a seal tries to hop onto your kayak, it’s best to paddle away calmly—seals, with their thick pelts and layers of fat, won’t. The reason why seals look like dogs is that seals are members of Carnivora, which is a group of carnivorous mammals that includes dogs. Sea lions also have a more rounded snout whereas the fur seal has a more pointed nose. They later develop an adult-like bark. barking cough. A loose collar can cause the device to activate when the dog is not barking, which will only increase his anxiety. The Weddell Seal has 34 different kinds of calls and can be. Bacteria or mold growing under the bark will. Adult females usually mate and give birth every year. “ Do all seals eat fish? No not all seals eat fish. Seals have shorter front and hind fur-covered flippers with long claws. (left) are brown, bark loudly, walk on land using their large flippers and have visible ear flaps. Bearded seals are the largest species of Arctic seal. Watch this orphaned baby seal throw the world’s biggest tantrum when her caretaker tries to clean her bathtub 😂💙To download a free Mutual of Omaha’s Wild K. Harbor seals vocalize mainly underwater. Sea lions often toss the fish or squid up and around until it can slide headfirst down the mouth. How do seals sleep. I have caught Bass and Pollack when they are no more than 150yds away. Infectious Croupwalruses. Allow the scratch to heal in the open air. A harbor seal has a rounded head with a fairly blunt snout. Best Answer. Being true seals, they lack external ear flaps and can only move on land by flopping along on their bellies, called “galumphing”. , the group that includes seals, sea lions and fur seals) that lives in the Bering and Chukchi seas where they haul out on sea ice and along the mainland coast and islands of Russia and Alaska. I often see them when I kayak near the lighthouse in Discovery Park. Wiki User. Fill the cracks with a latex caulking, let dry, sand of any excess if necessary. Use epoxy resin, thinned with acetone, and brush it on. SOUND ON! Ever wonder what a harbor seal pup sounds like?! Check out this video to find out. How Do Seals Communicate? All kinds of seals communicate vocally by making noise with their throat and air. There are more than 30 species of seals worldwide. They are known to consume large quantities of food at a time, about 5 to 8% of their body weight, 15–35 pounds, at a single feeding. Fun Facts: Sea Lions. Dogs and seals can pass sicknesses to each other, like distemper. Symptoms of cr. To stop a dog from barking, a bark collar, also known as an anti-bark device, emits an electric shock when it barks. Then, let the polyurethane dry for at least 24 hours. They both have jaws full of teeth and have whiskers and fur too. What do seals do at night? Seals sleep in the water as well as on land. Croup is a very contagious respiratory infection that mostly affects babies and young children. a May 2021 report of three children, ages 11 months, 2 years, and 9 years, with barking cough, stridor, and respiratory distress There’s overlap between the symptoms of croup and the common. In most cases, it’s best to do nothing. Dogs bark for a variety of reasons, but sometimes it can be hard to figure out why they’re doing it. Do seals and sea lions bark like dogs? A sea lion’s vocal is a bark, similar to a dog, and is unique to each animal!They are called harbor seal pups as they make an adorable sound like a puppy by barking. Their vocalizations consist of “local calls” and long-distance “broadcast calls. At birth, pups average about 130 cm in length and 34 kg in weight. Seals have small flippers, wriggle on their bellies on land, and lack visible ear flaps. Do seals like being pet? Seals may look cuddly, but never pet or feed them. They use their flat back teeth to crush food that has a hard shell before swallowing. Two species inhabit the sanctuary, the elephant seal and harbor seal. Seals have shorter front and hind fur-covered flippers with long claws. Appearance. Dip a brush into polyurethane and spread it evenly over the surface of the wood and work it into the rough bark along the sides. Barking Cough Symptoms in Adults. Seal the wood with polyurethane to protect it from moisture damage. Published June 11, 2020, 4:27 p. The breeding season typically begins in November and lasts 2–3 months. If these layers get damaged enough, it can spell certain doom for the tree. . Wash the wound thoroughly with plain water after this. They also have excellent hearing and can communicate. Male seals use their sounds as a way to establish who will do the most mating in the group of seals, or harem. Why do seals bark? A California sea lion’s primary means of communication is vocalization. Historically, it has been eaten in many parts of the world, both as a part of a normal diet, and as sustenance. The collar must be worn snugly so that the correction is felt by the dog and not the owner. Harbor seals are opportunistic feeders who tend to hunt for fish, cephalopods, and other invertebrates during high tide. Head. Being true seals, they lack external ear flaps and can only move on land by flopping along on their bellies, called “galumphing”. Some non-dog animals that bark, however, are squirrels, meerkats, deer, baboons, antpitta birds, barking owls, seals, and capybaras. The classic symptom of croup is a harsh, brassy cough that sounds like a seal's bark. A group of sea lions is called a colony on land, and a raft when in the water. The harbor seal, often called the common seal, is a native of the coastal waters of the northern hemisphere. All sea lions are carnivores, eating fish, squid, crabs, and clams. Sea lions will “bark” like that of dogs while seals will emit a “snarl”. Fights may result in injury, but are rarely fatal. Though it’s a trick easily taught to trained captive. Woof is the most common onomatopoeia in the English language for this sound, especially for large dogs. In addition to sounding like a barking seal, a croup cough can also. [2]Seals use a variety of sounds to communicate with each other. The California sea lion (Zalophus californianus) is a coastal eared seal native to western North America. , all marine mammals, including seals, are federally protected under the Marine. In the late 1970s, a harbor seal named Hoover began catcalling passersby at the New England Aquarium in a thick Maine accent. ” Kingdom: | Animalia Phylum: | Chordata Class: | Mammalia. Like seal claps, those chest beats carry two messages: I am strong, stay away; and I am strong, my genes are good. "right" temperature, the brakes are fine. This is critical if you'll be displaying your wood with bark outside. Between late fall and early spring, however, they can weigh up to 430 kg. In general, seal bark = croup. ”. Pinnipeds (/ˈpɪnᵻˌpɛdz/) (from Latin pinna "fin" and pes, pedis "foot"[2]), commonly known as seals,[a] are a widely distributed and diverse clade of carnivo. Sea lions (left) are brown, bark loudly, “walk” on land using their large flippers and have visible ear flaps. Scientists have no idea why this is. Seals rarely congregate, instead hunting solo and only gathering to mate. Meaning or Interpretation. This answer is: Unlike their California sea lion neighbors that bark loudly, harbor seals rarely make noise except when disturbed by another being in their personal space. Harbor seals grow to a maximum length of 6. Alone where seals bark in the mist. Classification: Mammal. Specifically, seals are caniform (doglike) carnivorans. The Seal Sitters will also have info for you. Sea otters are smaller than seals and sea lions, have stubby front paws and rest. 3 m in length and 200 to 250 kg in weight, with females larger than males. In the spring and early summer when the tree is actively growing this layer is weak, hence the ease of stripping bark off trees early in the growing season. Range. Fur seals are further distinguished from sea lions by the presence of a thick layer of fur that protects them from the cold water. For example, birds use songs to. Ringed seals live in the Arctic seas and the North Pacific Ocean, as far south as Japan. But such human contact does more harm than good. They both have jaws full of teeth and have whiskers and fur too. 1M subscribers Share 30K views 8 years ago If you're near a sea lion, chances are you'll hear its distinctive bark before you see it. Do seals bark? Are seals smarter than dogs? How intelligent are seals? Are seals more closely related to dogs or cats? Can you pet a penguin?. Pinnipeds (/ˈpɪnᵻˌpɛdz/) (from Latin pinna "fin" and pes, pedis "foot"[2]), commonly known as seals,[a] are a widely distributed and diverse clade of carnivo. This is critical if you’ll be displaying your wood with bark outside. Why Do Sea Lions Bark Constantly? Sea lions constantly bark when they are establishing territories. . Some species have evolved the ability to hold their breath for up to two hours and dive to depths of more than 6,500 feet when. . #SealSounds #NorfolkSeals #SealBark #Seals #Bark #SamsungGalaxyS4 #S4Claim: Otters sometimes rape baby seals. Seals are optimal food sources because their blubber is so rich in calories and fat. One quick way to tell a sea lion from a seal is to look at its ears. But what sound exactly do seals make? We don't often think about seal barking, but. We typically use a small chisel and hammer and angle the chisel with the way the live edge tapers. If there is inflammation in your dog’s larynx, then their airway can become narrow. Croup can sound alarming but can usually be treated at home. Marine Corps Multi-Purpose Canine with 1st Raider Battalion, Marine Corps Forces Special Operations Command prepares to rappel with his dog handler. Fur seals have whiskers, which are also called vibrissae. A child with a seal-like, barking croup cough, can usually be treated at home. Being true seals, they lack external ear flaps and can only move on land by flopping along on their bellies, called “galumphing”. Millions of years ago, the ancestors of pinnipeds lived on land. Their heads resemble those of dogs with long, pointed snouts. . The loud high-frequency noise is able to cut through. Using microphones, our team recorded 360 seals making over 3800 vocalisations at Pelican Point and Cape Cross during the 2019-20 breeding season. Breast Cancer. But that doesn’t make them close cousins. The range, pitch, and variety of these noises, however, are all vast. Physical Description. Immediate medical attention is required if croup threatens your child’s ability to breath. Male sea otters sometimes attack baby seals and attempt to mate with them, writes Brian Switek for Slate. Seal hunting is a popular activity for many people, and some would say that SEALs are more like cats than dogs. Most people describe a croup cough as sounding like a barking seal. Additionally, their streamlined shape and ability to move on land with a bounding gait. S. In air, they may snort, hiss, growl, or sneeze - often as a threat to another seal. If the airways continue to swell, breathing gets harder. Seals do not eat on land. How do seals bark?Bark collars work by delivering a correction to your dog when they bark. Traveling requires the back and forth shift of weight from their upper body to their pelvic region, almost like a caterpillar. If the damage to the bark is small enough that the tree is likely to survive on its own, you should still make sure that it heals cleanly. A bark is a sound most often produced by dogs. Seals do not bark as sea lions do; they instead communicate by grunting and slapping the water with their fins. Most food is just swallowed whole. Barking and trumpeting can alert an approaching male to steer clear of a claimed area, but if a male enters another’s territory fighting ensues. 4 m) and weight of 950 pounds (432 kg). The majority of the function of the lost bark won’t come back as the tree bark seals itself over, similar to how areas of scar tissue on humans can lose feeling and function. Did seals evolve from dogs? “Dogs and seals are not in the same family, however, and are not closely related. Apply the spray around the sides of the stump from top to bottom. The small island's remote location — more than 250 miles. California sea lions frequently interact with these species in. Dr Ben Burville, a researcher at Newcastle University, UK, h. Seals see very well under water—better than they do in bright light above water. A seal clapping its flippers may not sound like a great revelation. Dogs are capable of coughing like a seal would bark, but it is not a common occurrence. Bearded seals are 7-8. . Clapping seals are obviously nothing new, as captive individuals can be taught to clap their flippers on command, as is often the case at aquatic theme parks. 1 feet and weigh 250–370 pounds. The front flippers have small claws that grip when they are on land. Seal meat. Can you eat a barberry? The red berries or fruit of the plant are edible and a rich source of vitamin C with a very sharp taste. Most of the barking happens while a male seal establishes his territory. In air, they may snort, hiss, growl, or sneeze – often as a threat to another seal. Dogs and seals are both carnivores so they are related but not as closely as many other species. Or, if you can put it in a kiln right away — that is even. So, males can get up to five thousand pounds, and a female is a thousand pounds. Seals are related to dogs, but they are not very closely related. Harbor seals vocalize mainly underwater. They're really big animals. If your dog’s bark sounds hoarse, it may be a sign that your dog is suffering from laryngitis. Seals are commonly referred to as dogs of the sea. These animals live in the ocean, but are able to come on land for long periods of time. 5 feet and between 330-450 pounds in weight. Those seeking a glimpse of a harbor seal can find an overlook to gaze out over the waters to try and spot one of these watchful creatures. Do seal barks? Seals do not bark as sea lions do; they instead communicate by grunting and slapping the water with their fins. Allow the scratch to heal in the open air. They are also social creatures, sometimes congregating in social groups of up to 1,500 individuals. Harbor seals vocalize mainly underwater. Trees need to seal and close, and generally they do this much better without. Published on 10/4/2018 at 5:29 PM. Most pups are weaned at 12 months of age. Other symptoms that could come with the ailment include: Wheezing, Fever, Cyanosis, Hoarseness, Runny or stuffy nose, Labored. Read on for more details on why these two animals are further apart than you might think. Aggressive or territorial behavior. A barking cough in children can be a sign of a life-threatening condition such as a blocked airway. They're big in size. During the breeding season, male California sea lions bark incessantly when establishing territories; once established, the males bark only when maintaining and defending their territories. m. . Their vocalizations consist of “local calls” and long-distance “broadcast calls. Unfettered by bark pressure, the responding callus cells on the edges of a wound grow freely and form elongated rolls. They lie in wait just under the ice for a hapless seal pup or an unwary penguin to venture into the water, then quickly attack with their large mouths and powerful jaws. But when it comes from your child, it’s likely to set off alarm bells. Respiratory problems, infections, or injuries to the throat or vocal cords can affect their bark. Can a human outrun…The Kwakiutl (Kwakwaka'wakw) hunted seal on open water with a harpoon of a barbed head and a line of cedar bark and sinew; when seals were found resting on the shore, Kwakiutl used clubs [11, 63]. Do. I have had seals pinch Mackerel from my line when fishing in Cornwall. Before it hits that. How do you seal wood bark? To prevent moisture damage, seal the wood with polyurethane. Ramsey Island, Pembrokeshire, Wales. Why do seals bark like dogs? This is likely due to their shared ancestry. Barking is all well and good when it comes from your family dog or a seal at the beach. Why seals bark? seals are related to canines like dogs and wolves. FAQ about seals. Large cavities may never. . And during a. Their loud barks and growls can be heard as far as Mount Tolmie. This type of cough is most often associated with croup (laryngotracheitis). . Method 1 – Clean cutting the wound. Recent studies have shown that both Seals and Sea Lions are as smart as dogs and may be smarter. In comparison, sea lions have longer skin-covered flippers with claws on the hind flippers, which. Barking. 1. Do seals bark like dogs? READ: What city has the best BBQ in America? A bark is a sound most commonly produced by dogs. This makes bonding the bark very difficult. Unlike other types of seals, harbor seals do not have a visible earflap. Take a listen to a sea_lion Harbor seals also produce a wide variety of in-air vocalizations, including short barks, tonal honks, grunts, growls, roars, moans, and pup contact calls. You can even spot them on piers, beaches, and other places with a human presence!A dog’s bark can become hoarse as a result of a common infection. 2 kHz. 1). How do seals bark? Seals do not bark as sea lions do; they instead communicate by grunting and slapping the water with their fins. Our exploration revealed that seals do indeed produce sounds that are often reminiscent of barks, particularly among the true seals such as harbor seals and grey. There are a couple of things that you can do to improve your chances of keeping the bark on your wood: Cut the stock in the winter when the sap is not flowing. Removing the bark on a live edge slab is a pretty simple process. They are uniformly dark brown and vocalize with the notable sea lion "bark". Bark collars are not recommended as a first line of defense in the case of barking. All sea lions are carnivores, eating fish, squid, crabs, and clams. Sea Lions first started to appear on Pier 39 in 1989. ET. 3. Seals do not bark as sea lions do; they instead communicate by grunting and slapping the water with their fins. A wild grey seal ( Halichoerus grypus) has been caught “clapping” on camera for the first time, making sounds that resemble “shotgun-like cracks”. Vocalization to communicate presence, location, or warning. The range, pitch, and variety of these noises, however, are all vast. hoarse voice. The harbor seal diet volume is around 5-6% of their body weight. Trainer of Cetaecaens and Pinnipeds, Ray Molnar explains some of the purposes of harbor seal vocalizations at a young age, purposes of marking territory and males courting. Do seals bark? Seals do not bark as sea lions do; they instead communicate by grunting and slapping the water with their fins. Chordates are determined to have a hollow dorsal nerve cord, notochord, pharyngeal slits, endostyle or thyroid, and/or post-anal tail. a few more sea lion facts. What do they eat? Harbor seals can eat fishes like cod, herring, mackerel, salmon, hake, and flounder. Status: Threatened. Seals - bark Sheep - bleat Snakes - hiss Sparrows - chirp, twitter Squirrels - squeak Stags - bellow Swallows - twitter, squeal Swans - cry Tigers - growl, roar Thrushes - whistle, sing Turkeys - gobble Vultures - scream Walruses - groan Whales - sing. It’s already something of a mecca for wildlife lovers before you even get to the seals. We don’t quite know if a seal would react to his environment the same way a dog does—but we do know that they both have quite a loud bark when they want to! Seals have been observed letting out all-too-familiar “arf, arf’s” as well as loud, drawn-out whines and wails that you’ve probably noticed Fido making on occasion, too. Harbor seals are monitored during their breeding and molting seasons (March-July), when protected haul-out sites are critical to successfully give birth, nurse, and molt (when the seals lose their worn fur and grow a fresh coat). After all of the big pieces are removed, you can sand the rest until your edge has a smooth surface. This cough is often worse at night. What is the sound a seals make? Seal sounds to learn. Its natural habitat ranges from southeast Alaska to central Mexico, including the Gulf of California. 8 m. . The thing is, there is no one-size-fits-all. If you're near a sea lion, chances are you'll hear its distinctive bark before you see it. Seals and dogs have similar ancestory and shared genes. Polyurethane is a clear finish that will protect your wood from moisture and wear. Wiki User. Sea lions and seals are not related to other marine mammals, but are actually Caniformes, just like bears and the domestic dog. Seals can come in a range of sizes, from the 1. Do not clean out debris from inside a hole or cavity type of wound, and do not fill the hole with cement or mortar. Are orcas and wolves related? Do seals have balls? Are seals brutal? “Dogs and seals are not in the same family, however, and are not closely related. Seals have smaller flippers, wriggle on their bellies on land, and lack visible ear flaps. One female Grey seal around the Shetland Isles in Scotland was known to be 46 years old. California sea lions are playful, intelligent, and very vocal (sounding like barking dogs). Ramsey Island is a tiny fragment of the north Pembrokeshire coast that lies a stone’s throw off the St David’s headland out in the Irish Sea. It might arguably be considered barking, but scientists claim to have taught seals to ‘sing’ popular tunes, such as the Star Wars melody. Once the wood is completely dry, the bark is often very prone to falling off. Their eyes must focus on both air and water, therefore, they are very large and round. They live in coastal waters and on beaches, docks, buoys, and jetties. . Acetone will allow the epoxy to flow and penetrate deep into the fibers of. Seals tend to only bark or scream when in danger. Fertilize and replenish the tree. They. This is Fritz, one of our Wildlife Response patients. Watch on. Bearded seals live for an average of 25 to 30 years. Here, caretakers at Smithsonian's National Zoo explain why. Sealing the surface of wood before epoxy can be the difference between a successful project and one that fails. 1M subscribers Share 30K views 8 years ago If you're near a sea lion, chances are you'll hear its distinctive bark before you see it. When on land, a seal moves by bouncing in a caterpillar like motion. Harbor seals are graceful and agile swimmers, but are very awkward when on land. San Diego ZooSeals are a group of three families and 33 species of web-footed aquatic mammals. Sea lions are known to bark whenever they come out of the water as they snort to clear their nostrils. Try steam, cold air and plenty of down time. Description. Flippers: All seals have four fin-like appendages called flippers, which help them move on land and sea. You need to stay at least 50 yards back from seals and sea lions. Do not approach on a vessel within 30 metres of a seal haul out site. A barking cough is a dry, harsh cough that resembles the sound of a barking seal. A seal bark sounds somewhat like a happy dog while it’s playing. If your toddler has a dog barking cough, there are a few things you can do to help. How do you treat damaged tree bark? If the tree is simply scratched, wash the wound out with plain soap and water to help reduce the number of pathogens that may be in the scratch and that could cause further damage. Watch this orphaned baby seal throw the world’s biggest tantrum when her caretaker tries to clean her bathtub 😂💙To download a free Mutual of Omaha’s Wild K. Once the tree bark wound scars, new wood will grow around it. Being true seals, they lack external ear flaps and can only move on. seals are related to canines like dogs and wolves. But when it comes from your child, it’s likely to set off alarm bells. Seals can come in a range of sizes, from the. How deep can they dive? 4. Seals have a natural. Also referred to as “eared seals,” sea lions do have visible external ear flaps. If your dog is barking like a seal, it could be because they’re trying to communicate something to you. They are mainly found in or around ice-covered areas. Here’s a table of common seal sounds along with their meanings or interpretations: Seal Sound. He did confirm the entire platoon, about 20 SEALs, proudly wore the barking seal logo. Keep noise to a minimum when observing seals on land – preferably so that they cannot see or hear you. On land, seals use their bellies to move around because they have small front flippers that are thinly webbed with a claw on each small toe. Sea lions (left) are brown, bark loudly, “walk” on land using their large flippers and have visible ear flaps. Sea lions are known to bark whenever they come out of the water as they snort to clear their nostrils. Other things this noise has been described as resembling include a goose-like honk, or a broken squeaky toy. 42K views 5 years ago. In the U. Canines share a lot of similar characteristics with seals, for example, mainly because both the fluffy dogs and baby seals are considered Caniformes (which literally means “dog-like”) and come from the same suborder of Carnivorans. Ask a kid for the. " Dr Hocking said clapping seals demonstrates just how much there still is to. Moaning. They can dive over a mile. It is easy to identify croup because of the harsh barking sound that the patient makes. The average length for an adult harbor seal is 1. Bacteria or mold growing under the bark will reduce its bond to the wood. Re: Singing Seals I have only ever heard seals barking, once had one about 4ft from stern of our mirror bark in the fog, I nearly needed a heads on board a dinghy, As for Dolphins, we had them all the way across the Irish sea both ways and across the Bristol Channel, pods of 40 plus. Then, let the polyurethane dry for at least 24 hours. Why do seaMore answers. Their numbers there fluctuate seasonally. Seals are essential members of their ecosystems, both as predators of fish, squid. 4. Findings from this study may explain the biological mechanisms that enable the brain to remain alert during waking hours and go off-line during sleep. Its ear openings close when it dives. Most cases of croup are mild and may just require parental guidance and reassurance.